NYT: a student helps a security guard tackle a student carrying a rifle:

The scene at the university yesterday underlined how campus security has been rethought in this country since April, when a gunman killed 32 people at Virginia Tech. Instead of fleeing out of classrooms and onto the street, students at St. John’s were instructed, via text message to their cellphones, to stay where they were.

The messages went out so rapidly that Mr. Benson, a 21-year-old criminal justice major and police cadet, who held Mr. Hiraman against the wall, said he felt his cellphone vibrate with the information while he was restraining the gunman.

Fantastic little detail really helps give this “happy-ending” story some punch.